Because not every SS has the problem (and not every Strat or Strat copy), it is obviously NOT the design of the pickup cavity.
Plastic and low humidity with minimal grounding/shielding.
Solution:
More humidity.
More shielding/grounding.
Less unsupported theories.
Plastic and low humidity with minimal grounding/shielding.
Solution:
More humidity.
More shielding/grounding.
Less unsupported theories.
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